I'm a designer who wants to understand measurements. The device is 13,56MHz RFID short range (5cm) reader. Sidebands measurement: In 7.4.2 I read: "The transmitter shall be modulated with standard test modulation...." Spurious emission measurement: In 7.5.3.1 I read: "The equipment under test shall be switched on with normal modulation....." Then according to Annex G the sidebands limit for 13,59MHz + 900kHz and more is -16dBuA/m and for spurious emission in the same frequency range the limit is -3.5dBuA/m (7.5.3.2 Table 8). Tell me please how to distinguish sideband from spurious (if both are measured with modulation switched on) to know which limit to apply ? Do I have to look if the same is on the right and left of 13,56 than -16dBuA/m and if only on one sight then -3.5dBuA/m ? If it is to be done that way than what is the logic behind saying that for example signal 16,56MHz is more danger for other devices if there is also the same amplitude signal at 10,56MHz (limit -16dBuA/m) then if there is no signal at 10,56MHz (limit -3.5dBuA/m) ? In 6.5 I read: "there should preferably be a facility to operate the transmitter in an unmodulated state", but I didn't found the measurement when I will have to set my reader to work with unmodulated field. What am I missing? Best regards Piotr Galka MicroMade Poland - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]>
All emc-pstc postings are archived and searchable on the web at http://product-compliance.oc.ieee.org/ Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher <[email protected]> David Heald <[email protected]>
